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Smallpdf offers Free Trial, but SimPDF does not.
SimPDF is designed for Individuals, Freelancers and Small Business.
Smallpdf is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
The starting price of Smallpdf begins at $7/User/Month when Billed Yearly, while pricing details for SimPDF are unavailable.
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Some top alternatives to Smallpdf includes AltoPDF, ZonePDF, iLovePDF, Adobe Acrobat DC, pdfFiller, Easy PDF, Soda PDF, PDFChef, DeftPDF, LightPDF and EaseUS PDF Editor.